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Old 07-02-2002, 12:46 PM
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Red face Gas in the oil pan

I am in the last stages of completing a 23 TBucket. A stroked 350 to a 383 w/400hp. I bought a long block and mounted a Demon 660 carb. (everyting is new)

The first startup went very smooth. As soon as the gas pressure reached the carb, it lite right off. and ran good.

I finished the steering, etc... and wanted to start the car again. I had a hard time starting it and when it did start it quickly flooded out. In checking several things, I found gas in the oil pan. I replaced the power valve in the carb but I got the same results.

The mechanical fuel pump is maintaining around 6.5 to 7 psi to the carb.

ANY help/thoughts would be greatly appreciated.
If anyone knows a mechanic that makes house calls in northwest Atlanta area, please let me know.

Thanks

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Old 07-02-2002, 02:19 PM
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Check to see that the diaphram in the fuel pump didn't rupture. That would cause gas to get into the oil and not get it up to the carb. This usually happens in corvairs but it could in other mechanical fuel pump engines. Carb flooding could be a stuck float in the carb. It also seems that 7 psi is high for a carb. That would be more for fuel injection. I believe a carb should be at 3 psi. You might need a pressure regulator.

[ July 02, 2002: Message edited by: Mertz ]</p>
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Old 07-02-2002, 04:13 PM
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7 PSI actually isn't too bad unless you have an Edelbrock carb, then you're screwed. They don't like more than 5-6 PSI. Over that they will push fuel past the needle valve. If you have fuel pump problem as already stated, you can get fuel in the oil. If you have one of those fuel pumps that you can rotate the lower half to line up your fuel lines, they state right in the manual to be sure to fully stroke the actuator arm before you tighten the lower half bolts or you will tear the diaphram.
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Old 07-03-2002, 04:06 AM
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Thank you F100. I have an Edelbrock carb and I am getting 7-8 PSI and I am having some overload problems. I think you have just solved my problem. I plan on twisting wrenchews over the holiday and I will install a pressure valve. Thanx
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Old 07-08-2002, 03:36 AM
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Thanks for all your help people! I adjusted the PSI down to 2 to 3 and that seem to take care of the problem..... It runs and idles now!

I guess I need to add a regulator valve (instead of the visegrips I used for testing) to the fuel system.

Thank for all you help, this is a great site with people who really take time to help us less experienced rookies.
Thanks

[ July 08, 2002: Message edited by: mar10 ]

[ July 08, 2002: Message edited by: mar10 ]</p>
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